Pump-measuring device



.May 27, 1924. 1,495,772

M. J. BROWN PUMP MEASURING DEVICE Filed Sept. 19. 1921 WITNESS .INVENTOR ri Mow/MmJ Emu/N 51 ATTORNEYS l atented tat 2v, l92d..

stares FAT? MORTIMER J. BROWN, LOS ANGELES, CALIFORNIA, ASSIGNOB TO THE PACIEIC R & H'CHEM ICAL CORPORATION, OF ANGELE,

OF CALIFORNIA.

@LIFORNIA, A CORPQRATIQN k. inf-4. G DEVICE.

a State of California, have invented a certain new and useful Pump-Measuring Device, of

which the following is a specification.

The invention relates to measuring pumps and particularly to means for limiting the itroke of the pump to certain predetermined en s.

An object of the invention is to p i ovide a simple, ruggedmeans for limiting the stroke of a pump piston to variable predetermined lengths.

Another object of the invention is to provide means whereby the stroke of a pump iston may be readily changed from one ed predetermined length to another.

A further object of the invention is to provide a means for limiting the stroke of a pump piston, which means may be supported and contained within the pump barrel.

The invention possesses other advantageous features, some of which, with the foregoing, will be set forth at length in the following description where l shall outline in full, that form of the invention which I have selected for illustration in the drawings accompanying and forming part of the present specification. In saiddrawings l have shown one form of device embodying my invention, but it is to be understood that I do not limit myself to such form, since the invention, as set forth in the claims, may be embodied in a plurality of'forms.

Referring to said drawings:-

Figure 1 is a longitudinal section of a pump embodying my invention.

Fig. 2 is a ongitudinal section on a larger scale of the stroke limiting device of my invention.

Fi 3 is a side elevation of the stroke limiting device.

form of stroke limiting device.

The device of my invention is particularly adapted for use in'connection with apparatus employed in the fumi tion of citrous and other fruit trees. In t e fumigation of citrous trees, the tree is enclosed in an envelop and subjected to the action of a volatile fumigant such as hydrocyanic acid as. Liquid hydrocyanic acidis largely .usef as Fig. l is a side elevation of a modified the source of hydrocyanic acid gas and the functlon of the present device istodefinitely measure the charges of liquid hydrocyanic acid used. Difierent charges of liquid are used in connection with the difierent trees, whlch are previously dimensioned for this purpose, and the apparatus must be capable otquickly delivering the definite charge required by the tree under treatment. As hydrocyanlc acid fumigation is, actually practiced, the fumigators use units of 10, 12 t, 1e, 1e, 2e and 22 cubic centimeters oi liquid hydrocyanic acid, the particular unit used depending upon several factors such as I weather, tree and pest conditions, and since trees vary in size, the fumi ator must be. able to deliver any number 0 units at will. The'device of my invention provides a simple, rugged means for accomplishing this result.

The measuring or piston stroke controlling device of my invention is used in connection with a into which the iquid flows, gravity, from a superposed ta which it is ejected on the downstroke oil the iston a. The piston shown is of the valvuar type, which, on its u ward stroke is perump barrel or cylinder 2.

reierably by 3, and from vious, permitting the ow of liquid therethrough and on its downward stroke is impervious, ejecting the liquid from the pump arrel. The piston is described and claimed in an apgication filed September 19, 1921, by M. J. rown and C. J. Marvin Serial No. 501,578.

Means are provided for selectively limiting the stroke of the piston to certain redetermined lengths, and thereby accurate y and definitely measurin by the pump. In t e present construction, the downstroke of the piston is limited by contact with the bottom of the pum barrel.

the liquid discharged The u stroke of the piston is limited and contro led by a regulating device arranged with the dog in the slot and the piston reciprocated for the thus limited stroke, five units of: 18 c. c. each are ejected. The next slot may be dimensioned to cause the ejection of the piston ro is turned to bring the dog in engagement with that side or the slot from which the shoulder springs. This shoulder is preferably so positioned that it limits. the movement of the piston to eject one unit of liquid. Assuming that the dog is positioned\ in a composite slot of a length on one side to cause the ejection oi five units and on the other side to cause the ejection of one unit,

and it is desired to discharge l8 units of liquid to tumigate a given tree, the {fumigator then reciprocates the piston three times tor the full length of the longer slot, twists the handle to move the dog against the short tit) side or the slot and reciprocates'the piston three times in that position, The dog is so positioned that it does not move out of the slot when the piston strikes the bottom of the urn barrel and consequently there is no liability or error on the part of the fumigatorn v v When the conditions under which the inmigation is to be done are such that the dis-- charge of a difierent size of units per reciprocation of the piston will be advisable; the dog may be moved to another slot. This is accomplished by releasing the depending member at its upper end and raising it sutficiently to clear the dog, then turning the handle to bring the dog into alinement with the selected slot, and then lowering the depending member and securing it in position. The lower ends of the slots are preterably disposed in the same plane and the slots extend upwardly to diflerent distances to provide the desired predetermined discharge,

lln Fig. a l have shown a modified form of piston stroke controlling element in which a triple value slot is provided, The slot shown is provided-with a central portion 312 representing five units, a portion on one side limited by the shoulder 13 representing three units and a shoulder it on the other side representing one unit. By twisting the handle, the iuigator is enabled to eject three units, live units or one unit of liquid for each reciprocation oi the piston.

Other features of the invention shown or described, but not claimed herein, are claimed in another application filed by me simultaneously herewith.

ll claim:

It. The combination with a pump barrel having a piston therein connected to a piston rod, of stationary means disposed in the pump barrel intermediate its ends and co= "ton rod, 0

t eatre operating with the piston rod for limiting the strolre oi the piston at the will of the operator to selected variable lengths.

2, The combination with a pump barrel having a piston therein connected to a piston rod, of an element in said barrel pro- Vided with longitudinal slots of different lengths and a dog engaging in one of said slots to limit the movement of said piston,

3. The combination with a pump barrel having a piston therein connected to a piston rod, of a skirt depending into said barrel provided with a plurality of longitudinal slots of diderent length and a dog engaging in one or said slots to limit the movement of said iston.

d. The com ination with a pump barrel having a piston therein connected to a piston rod, of a shirt depending into said barrel andprovided with a plurality of longitudinal slots opening at the bottom of the shirt and a dog on the piston rod engaging in one of said slots.

5. The combination with a pump barrel having a piston therein connected to a piston rod, of means disposed in said barrel for limiting-the upward stroke of the piston comprising a skirt depending into said barrel and provided with a lurality of slots extending upwardly to di erent heights and a i dog on the piston rod engaging in one of said slots,

6.. In a pump for a poisonous volatile turnigant, the combination with a barrel, of a piston therein, an outlet adjacent one end oi the barrel, means around said piston rod at the opposite end of the barrel to revent leakage of the tumigant, and ad ustable means lined inside the barrel between its ltld ends for limiting the travel of: the piston to 4 predetermined lengths,

7., The combination with a pump barrel having a "oiston therein connected to a pi ton rod, or means for limiting the stroke oi the piston, to variable selected lengths, com l prising an element having a stepped longitudinal slot therein and a member engaging in said slot.

8, The combination with a pump barrel having a iston therein connected to a piemeans for limitin the strolre or? the piston to variable selecte lengths, come prising a depending skirt having a plurality of stepped longitudinal slots therein and a dog engaging in one of said slots 9. The combination with a pump barrel having a piston therein connected to a pieton rod, or means for limiting the strolre oil the piston to variable selected lengths, comprising an element having a longitudinal slot therein provided with shouders on its opposite sides and a member adapted to move in said slot and to engage either of said shoulders,

it), The combination with a pump barrel .fluid from said pump, a

me -77a having a piston therein connected to a pis ton rod, of means for limiting the stroke of the piston to variable selected lengths, comprising a skirt depending into said barrel and provided with a plurality of slots of difi'erent length opening on the lower edge of said skirt, a shoulder on the side wall of each slot and a dog secured to the piston rod and engaging in one of said slots and adapted to be moved to engage the upper end of the slot or the shoulder.

11. In a pump the combination with a barrel, of a piston therein for forcing a means cooperating with sai piston rod for selectively limiting the travel of said rod on rotation'thereof, said means and barrel being relatively ad'ustable to change the limits of piston travel. 12. In a pump the. combination with a barrel, of a piston therein, means for selectively limiting the movement of said piston which comprises a member having therein a plurality of longitudinal slots of difierent lengths all open at one end and closed at the other, a dog for engagement with said slots, means for limiting the movement of the dog iston rod, and

I to prevent its being moved out the open end spaced abutments located adjacent the lower and central portions of the skirt and adapt ed for co-operation with the piston rod" to limit its travel. a

14. In a pump the combination with a barrel, of a piston and piston rod therein, stop means inside the barrel provided with a plurality oflongitudinally spaced abutments said means and abutments being arranged to co-operate with the piston rod and permit a limited selection of piston travels on rotation of the piston rod, and to permit a larger selection of piston travels on adjustment of said means.

In testimony whereof, I have hereunto set my hand.

MORTIMER J. BROWN. 

